Pep is creating a new team. It will take time. He will most certainly succeed. When your star players are not in form or injured out for 4-5 months, it's unrealistic to expect exciting performances.
Foden and Torres are top talents but ain't Silva and Sane yet. Bernardo is struggling for form, Kevin is not quite the same, let alone Raz. But there is no reason to think these problems are permanent and won't be solved. In December we are playing better than in November, in January we will play better than in December. The potential of the team is huge and will be gradually realised.